What Observation or Interpretation Concerning the Himalayas Did Not Ultimately

question 31

Multiple Choice

What observation or interpretation concerning the Himalayas did not ultimately lead to our current understanding about the structure of mountains belts?

• A) George Airy's hypothesis that lighter, thicker mountain roots displace denser mantle rocks
• B) J. H. Pratt's estimate that, for a flat lower crustal boundary (Moho), the mountains should have deflected the plumb bob 3 times as much as was actually observed
• C) Sir George Everest's topographic triangulation survey that placed two towns 150 metres too close together because of the deflection of the vertical "plumb line" by the mass of the mountains
• D) The original GPS survey by Nicola Tesla that showed the convergence of India against the Tibetan Plateau was less than expected for seafloor spreading rates.

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